Github user markhamstra commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12631#discussion_r60834085
  
    --- Diff: build/mvn ---
    @@ -69,14 +69,23 @@ install_app() {
     
     # Install maven under the build/ folder
     install_mvn() {
    -  local 
APACHE_MIRROR=${APACHE_MIRROR:-'https://www.apache.org/dyn/closer.lua?action=download&filename='}
    +  MVN_VERSION="3.3.9"
    --- End diff --
    
    I mean that using this build/mvn script should work even if there isn't any 
version of maven currently installed on the machine (which might be the case, 
e.g., when using an automated tool to set up a new build node.)  I believe that 
would work with `--force` previously, and it should work when there isn't a 
`--force` option anymore.


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